Sofa



FIG. 1 is a front, top, and right side perspective view of a sofa, showing our new design;

FIG. 2 is a rear, top, and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a cross-sectional view taken along the line 8-8 in FIG. 3.

The left side view is omitted because it is a mirror image of the right side view. 

CLAIM The ornamental design for a sofa, as shown and described. 